There should be some difference in compression rates, not a lot, but
there should be some.

Setting the compression to 8 in FLAC doesn't promise to get you X
amount of compression, all it does it try harder to find ways of
compressing that given audio. The difference in processing tiems
between 0 and 8 is quite high (0 being quick, 9 being slow) but the
difference in compression is not relative to this :)

When you say 25% do you mean the resulting FLAC is 1/4 the size of the
original WAV or is it 25% less? The rough average compression you get
with FLAC is 50%, some music is more some less, but oer th course of a
varied music library it should be roughly 1/2.... ish :)

EDIT: Here is a comparison of different lossless codecs as well as FLAC
1.2.0 with different parameters:
http://flac.sourceforge.net/comparison_all_ratio.html

Some highlights:
FLAC 1.2.0 (-1)
Time: 6:24.51
Compression: 56.97% 

FLAC 1.2.0 (-8)
Time: 26:46.72
Copression: 53.36%


-- 
funkstar
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